Device identity and key ratings
The 1N6135AUS is a bidirectional Zener transient-voltage suppressor (TVS) from Microchip Technology, housed in a SQ-MELF B package. It delivers 500W peak pulse power per the 10/1000 µs waveform, with a minimum breakdown voltage of 152V and a maximum clamping voltage of 218.4V at 2.3A peak pulse current. The reverse standoff voltage is 121.6V typical, meaning the device does not conduct appreciably below that level — it sits transparently on the line until a surge pushes the voltage above the breakdown threshold. The wide range also gives headroom for derating when the device is mounted near hot components.
Package and rework considerations
The SQ-MELF B package is a surface-mount cylindrical body with metallised end caps — no leads, no visible pin 1. Orientation is marked by a cathode band on the body; for a bidirectional part like this one, the band still indicates the cathode end, but the device clamps symmetrically in both directions. Reworking a MELF requires care: the cylindrical shape can roll under the hot-air nozzle if the board is not fixtured, and the end-cap solder joints are small. Use a nozzle that covers the whole body, preheat the board, and let the part reflow without nudging it.
Lifecycle and sourcing posture
Packaging is Bulk. If you need tape-and-reel for automated assembly, confirm with your sourcing contact whether a reel option exists under the same base number — the evidence does not list one for this suffix.